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Foursquare now uses OpenStreetMap

"Foursquare has decided to drop Google Maps from its web
interface after three years in favour of the open source map
project, OpenStreetMap. OpenStreetMap is an editable wikia that
allows users to upload their GPS data, as well as physically editor
the vector mapping, and add points of interest.

"Foursquare have been considering the switch for six months,
with the increase in pricing for the Google Maps API, and noticing
that other companies were doing the same:"